Therapeutic lamp



N. FRUTKOW ETAL 1,823,535

THERAPEUTIC LAIP Filed Oct. 29, 1928 Sept. 15, 1931.

4 Sheets-Sheet l IIIIIIIIIIA Se t. 15, 1931. N. FRUTKOW ETAL THERAPEUTIC LAMP Filed Oct. 29, 1928 4 Sheets-Sheet 2 l- 1 l I Sept. 15, 1931. N. FRUTKOW ETAL 1,823,535

I THERAPEUTIC LAMP Filed Oct. 29,1928 4 Sheets-Sheet s Se t. 15, 1931. N. FRUTKOW ETAL THERAPEUTIC LAMP 4 Sheets-Sheet 4 Filed Oct. 29, 1928 Patented Sept. 15, 1931 UNITED STATES PATE'NT OFFICE THERAPEUTIC Lu? Application fled come: as, me. man Io. $15,705.

This invention has to do with an improved construction of therapeutic lamp,-

that is, a lamp for use in connection with therapeutic operations and examinations. The lamp herein disclosed is particularly intended for use in connection with a s 5- term of diagnosis and a diagnostic ta le which constitute the subject matter of another invention which we have made; but it will presently appear that the features of the present invention are not in any sense restricted to use in connection with the diagnostic system and table of that invention. Nevertheless the present lamp is es ecially adapted for that work, and there ore we shall make certain references to such system and apparatus.

The diagnostic system above referred to is one in which the body, or portion of the body, to be examined is subjected to a very powerful illumination from one side, so that the light will penetrate deeply into, and, in fact, substantially through, such body, thus bringing the entire mass into illumination. Said diagnostic system is also one in which there is provided at the other side of the body a microscope which can be brought to focus at any desired point within the portion so illuminated, thus making it ossible to make a detailed examination of t e inte-l rior portions of the body without resort to surgery.

Owing to the intense illumination necessary for this system, there may be generated an excessive amount of heat on the surface so illuminated. One of the objects of the.

present invention is to make provision for removal of this excess heat by means of a current of air directed over the surface of the body at the position illuminated. This air will carry away the heat as rapidly as the excess accumulates, so that the rise of temperature is limited.

Another object in connection with the foregoing is to associate a blower or other source of current of air directly with the powerful source of illumination or lamp, so

that the two parts may be brought into a more or less comblned structure of unitary and convenient arrangement. In some cases the blower for producing the current of air is directly built on to the lamp itself, whereas in other cases the two elements are directly combined, although not physically the same structure.

Another feature of the invention relates to the provision of an arrangement such that the electric current for the lamp will be automatically controlled by the operation of the blower so that the current will not be delivered to the lamp until the blower has reached an operating speed sufiicient to insure a lproper amount of heat-removing action. ikewise the current will be shut off from the lamp when the blower falls below a critical speed. These arran ements will prevent any danger of accumu ation of the excessive amount of heat due to failure of the motor to function properly.

A further feature of the invention relates to the provision of an arrangement such that the lamp element itself will not become overheated notwithstanding the fact that it is enclosed within a suitable housing and reflecting arrangement. This result 1s secured by the maintenance of a proper circulation of air past and around the lamp element.

Other objects and uses of the invention will appear from a detailed description of the same, which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings,-

Fig. 1 shows a side elevation of a lamp stand embodying the features of the resent invention, the lamp and controlling r eostat being carried by a bracket arm, and the motor-driven blower being mounted directly upon the lamp housing itself;

Fig. 2 shows a cross section on the line 2-2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 shows a vertical longitudinal section through the general construction of lamp and housing illustrated in Figs. 1 and 2, but on an enlarged scale;

Fig. 4 shows a cross section on the line 44 of Fig. 3, looking in the direction of the arrows;

Fig. 5 shows a view similar to that of Fig.

3 with the exception that a modified con-' struction of lamp is illustrated in which the air current is derived from a blower unit which is separate and distinct from the lamp housing itself;

Fig. 3 shows a top plan view correspondto Fig; 5; ig. 7 s ows diagrammatically a system of illuminatin a portion of a body wh ch 1s to be examine microscopically in its interlor portion, Fig. 7 showing the usg of condensing lenses and a water cooler, as well as thecooling by means of they air current;

Fig. 8 shows a detailed cross section throu h a centrifugal governor for controlling t e supply of current to the lamp when the motor speed becomes sufiicient, being a section on the line 8-8 of Fig. 3, looking in the direction of the arrows, but on'an enlar d scale;

ig. 9 shows a cross section on the line 99 of Fig. 8, looking in the direction of the arrows;

Fig. 10 shows a fragmentary detail of one poiittion of Fig. 9, but on an enlarged scale; an

Fig. 11 shows diagrammatically a system of electric circuits including'the centrifugal governor cut-out device.

.Referr'ing first to Figs. 1, 2, 3 and 4, the lamp. therein illustrated is conveniently shown as supported by a stand 13 having a base 14 which can be moved around conveniently on a floor surface 5, suitable casters 16 being provided-for this purpose. Said base 14 has the upstanding stand arm 17, the upper end of which carries a fixture 18. Another arm 19 is connected to the fixture 18 by a swivel joint 20, so that said arm 19 can be moved up and down on a horizontal pivot;

and another bracket 21 is connected to the threads thereof being of tapered diameter,

so that as said nut is tightened up the split portion will be forced or compressed together.

An arm 26 of a bifurcated bracket 27 is extended into the hollow arm 21, to which it is locked by tightening up the nut 24.

' The lamp proper is best illustrated in Figs. 3 and 4. It includes a cylindrical shell 28 open at one end (its bottom end in the construction illustrated), and the upper end of said shell is closed by means of a cupshaped cap 29 having its interior surface polished or of a reflecting nature.

A lamp socket 30 is secured into the upper central portion of the cap 29 and receives the stem of a powerful electric lamp 31.

Located at equidistant points around the asaaeat shell 28 are a series of air passages 32 (four in number). The lower ends of these passages are turned inwardly on a suflicient angle to insure a somewhat converging delivery of the air from their lower ends. The upper ends of said passages are carried up to the peripheral portion of a centrifugal blower 33 which is located immediately above the upper end 29 ofthe lamp housing. The u per ends of said passages 32 are connect into the air-discharge peripheral portion of said blower at more or less equiistant points, so that the currents of air will. be taken oil from said blower under the most advantageous conditions.

The blower itself is supported by the upper ends of the passages 32, and ordinarily no other form of support will be necessary. The motor 34 for driving said blower is located and supported immediately above the blower, as clearly indicated in Fig. 3.

The arrangement thus explained is such that when the motor-driven blower is operating currents of air will be forced down through the passages 32 and delivered in a converging fashion from their lower ends. The amount of such air delivered will be arranged to give the. proper amount of heat removal, depending upon the amount of illumination and heat generated by the lamp, as well as other factors.

In some casesit will be found desirable. to carry away a steady current of air from around the lamp 31 itself. This will be true in those cases where said lamp is of exceptionally large size and generates an exceptional amount of heat. For this purpose, if

desired, the passages 32 may be provided with lateral, inwardly extending sections 35, through which supplementary air will be drawn from the upper interior portion of the lamp housing by a siphoning or induction action. This air while warm, due to the heat given off by the lamp itself, will also be effective for the purpose of carrying heat away from the surface being illumlnated, since it is found that this result is produced, among other things, by the presence of a gentle current of air moving over the surface and somewhat irrespective of the exact temperature of said air current.

If desired, a series of other openings 36 may be provided around the upper portion of the lamp housing, through which air can enter and circulate upwardly through the housing to the passages 35. In the case of such openings 36 being provided, it will also be desirable to place a hood around the outside of the housing in line with said openings 36 so as to prevent a direct light radiation outwardly through said openings. This will avoid any interference with the use of the lamp due to light rays being delivered in improper directions.

- A suitable centrifugalgovernor is directlie its

naaauao 1 associated .with the motor 24 or with the shaft of the blower. This governor is shown more in detail in Figs. 8, 9 and 10. It includes a cylindrical housing 38 of nsulating material, the central lower portion of which is provided'with a hub 39 wh1ch may be mounted directlyupon the top of the motor 34 or the blower 33. The shaft of said motor or blower is shown at 40. Said shaft projects u into the housing 38, where it carries a dis of insulating material 41. Said disk of insulating material will rotate at the same s eed as the shaft 40, which is the speed of t e blower.

The disk 41 carries a pair of arms 42and 43, which are pivoted to the disk at the oints 44 and 45, but are normally drawn inwardly by means of. springs 46 and 47.

The outer ends of said arms carry centrifugal weights 48 and 49, so that when the speed becomes great enough the welghts will fly out into the full-line positions of Fig. 8.

The disk 41 also carries a flange 50 which rotates with the disk, and a pair of contact buttons 51 and 52 are provided in said flange. Said buttons are normally pressed outwardly by springs 53 into contact with a ring 54 located around the interior of the housing flange 38. Another plate 55 is placed in the lower portion of the housing; and a pair of contact plates 56 and 57 are placed on the disk 41 beneath the positions of the free ends of the arms 42 and 43. The plates 56 and 57 are provided with springpressed fingers or buttons 58 and 59 which make contact with the plate 55. Also the arms 42 and 43 are provided on their bottom faces with contacts working against the plates 56 and 57.

The flange 50 constitutes one side of the circuit and the plate 55 constitutes the other side of the circuit, and for this purpose the terminal contacts 60 and 61 are shown in conjunction with these parts. The arrangement is such that as soon as the rotative speed exceeds a certain amount the arms 42 and 43 will swing out and establish contact against the flange 50 or against the inner ends of the buttons 51 and 52, thus closing a circuit between the terminals 60 and 61. This is a portion of the circuit for the electric lamp.

Referring to Fig. 11, we have shown an electric circuit including the main switch 62 by which current is delivered into the system. When this switch is closed the current flows through the leads 63 and 64 to the terminals of the motor 65, thus starting the blower and speeding up the same. The centrifugal governor is designated in Fig. 11 by the numeral 66, and the shaft 40 is shown diagrammatically connecting said governor with the motor. The filament 67 of the electric lamp is shown as being connected to the lead 61 from the centrifugal governor, and by another lead 68 with the terminal wire 64.

Referring to Fi 7, in that case we have shown a powerful 7am -69 supplying a light beam through a set 0 condensing lenses 70 and through a Water bath 71 down on to the surface of the body 72. In this figure we have shown the blower 73 as supplying a current of air 74 flowing over the surface of the body 72 at the point which is being strongly illuminated.

The rays of light 75 are shown as passing through the body 72 so as to illuminate the interior ortions thereof; and a microscope 76 is illustrated for examining any selected portion of the interior of the body thus illuminated.

In Figs. 5 and 6 we have shown a modified construction in which the blower unit is not physically supported by the lam housing, although directly connected wit it. In this construction the cylindrical lamp housing 77 has its upper end closed by the head 78, the interior surface of which is made of a reflecting character. The lamp 79 is connected into a socket 80 in the head 78, as in the previous construction.

In the present case, however, there is provided a passage 81 around the lower or open end of the housing 77, which passage 81 is provided with a series of delivery orifices 82. The passage 81 is connected by a hose or conduit 83 with a suitable supply of the air.

In order to avoid excessive rise of temperature of the lamp 79 itself, we have provided a series of openings 84 around the central portion of the housing 77, through which air may be drawn into the housing to cool the upper portion thereof. In such case a baffle 85 is preferably laced around the housing at the position 0 the openings 84 so as to prevent a direct radiation of light which would interfere with the proper diagnostic operations.

A conduit 86 extends across the housing, and is provided with a series of openings 87 on its bottom side, said openings communicating directly with similar openings in the head 78 of the cylindrical housing. Bafiles 88 are spaced beneath the openings 87 and are faced in such a direction that the current of air flowing through the conduit 86 will tend to draw air up through the While we have herein shown and described only certain embodiments of our present, invention, still we do not intend to limit ourselves thereto except as we may do so. in the claims.

We claim:

1. A therapeutic lam including in combination a cylindrical s ell open at one end and closed at the other end, a lam socket in the closed end thereof, a plum ity of air conduits extending lengthwise of said shell and having discharge orifices adjacent to the open end of the shell for the delivery of a current of air therefrom, there bein a series of vent openings around the centra portion of the shell for the admission of air therethrough into the body of the shell, a has plate secured to and spaced from the outer surface of the shell around the position of said vent o enings to thereby cut ofi direct radiation of light through said openings, a centrifugal blower secured to and mounted upbn the upper portion of the shell, air delivery connections from the peri heral ortion of said blower to the con uits a oresaid, a driving motor connected to'the blower shaft, a centrifugal circuit governor connected to the blower shaft, and electric circuits for supplying current to the motor and for also supplying current to the lamp when the motor speed exceeds a predetermined amount, substantially as described.

2. A therapeutic 1am including in combination a cylindrical s ell open at one end and closed at the other end, a lamp socket in the closed end thereof, a plurality of airconduits extending lengthwise of said shell and having discharge orifices adjacent to the open end of the shell for'the delivery of a current of air therefrom, a centrifugal blower secured to and mounted upon the 4 upper portion of the shell, air delivery con- -motor speed exceeds nections from the peripheral portion ofsaid blower to the conduits aforesaid,'a driving motor connected to the blower shaft, a centrifugal circuit governor connected to the blower shaft, and electric circuits for supplying current to the motor and for also supplying current to the lamp when the a predetermined amount, substantially as described.

3. A therapeutic lamp including" in cornbination a cylindrical shell open at one end and closed at the other end, a; lamp socket in the closed end thereof, a plurality of air conduits extending lengthwise of said-shell and having a discharge orifice adjacent to the open end of the shell for a delivery of a current of air therefrom, a centrifugal blower, air delivery connections therefrom to the air conduits aforesaid, a driving motor connected to the blower shaft, a centrifugal circuit governor connected to the blower shaft and electric circuits for supplying current to the motor.and for also supplying curmnt to the only when the motor speed exceeds a preetermined amount, substantially asdescri a. In a device of the class described, the combination of a lamp element, means for directing the illumination thereof in a desired direction, conduits for-the delivery of a current of air to the object to be illuminated thereby for cooling purposes, a rotary blower, a motor for drivm the same,'and electric circuits for supply 0 current'to said motor and to said lamp, and a centrifugal circuit breaking device in the circuit to the lam and ratively connected to the blowor e ectivey to retam the lamp circuit open until the blower attains a prescribed ed and to close the lamp circuit for supp y' of current to the lamp when the blower d exceeds a prescribed amount, substantially as described.

5. In a device of the class described, the combination of an electric lamp, means for directing acurrent of cooling an, to an -object illuminated thereby for. cooling purposes, a rotary blower for supply of air thereto, and electric circuits for supply of current to drive said rotary blower and also to illuminate the lamp, the lamp circuit includin a centrifugal circuit cooling device operative efi'ectively to insure closing of the lamp circuit only when the blower speed exceeds a stantially as described.

NANIEL rnurxow. ANTQNIUS J. i N.

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